Manufacture of metal pulleys.



No. 782,509. PATENTED FEB. 14, 1905;

' w. LIVINGSTONE.

MANUFACTURE OF METAL PULLEYS.

APPLICATION FILED JAN. 4, 1904.

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iTEn S rarns Patented February 14, 1905;

ATENT FFICE.

MANUFACTURE OF METAL PULLEYS.

SPECIFICATION forming part of Letters Patent No. 782,509, dated February14, 1905.

Application filed January 4, 1994. Serial No. 187,897.

To all whom, it nuty concern:

Be it known that I, WILLIAM LIVINGSTONE, a citizen of the United States,residing at Flushing, New York,have invented Improvements in theManufacture of Metal Pulleys, of which the following is a specification.This invention relates to the manufactur of metal pulleys, and hasspecial reference to a simple and practical method of producingsheet-metal pulleys of the type designed for sash-cord and analogouspurposes.

A special object of the invention is to provide a novel method offorming a concaved or peripherallygrooved pulley or wheel-rim whereinthe peripheral side flanges of the pulley or wheel are uniformly andstrongly formed throughout without the formation of weak places at anypoint and without danger of edge-cracking, which would ordinarily be dueto the stretching of the metal side flanges when the blank is shapedinto its circular form.

A further object is to provide anovel method of forming a pulley-rim inconjunction with a sheet-metal spoke and hub formation for retaining therim in its circular or wheel form.

With these and many other objects in view, which willmore readily appearas the nature of theinvention is better understood, the same consists inthe novel construction, combination, and arrangement of parts which willbe hereinafter more fully described, illustrated,

and claimed.

The essential feature of the invention involved in the rim formation isnecessarily susceptible tostructuralfchange; but a preferred embodimentof the invention is shown in the accompanying drawings, in whicl WFigure 1 is a plan View of a sheet-metal. blank from which thepulley-rim is to be made an. representing the first step in the process.Fig. 2 is an edge view of the crimped or corrugated blank, showing theprojection of the crimps or corrugations equally above and below to thethickness of the blank. Fig. 3 is a view illustrating the third steps ofthe process, wherein the blank is bent into its circular form. Figs. 4and 5 show the rim com,

plete with the crimps or corrugations pressed out to supply thenecessary material for the formation of the concave or groove. Fig.5

is alside view of the completed rim, showing a sheet-metal spoke-spideradapted thereto for making a complete pulley and for holding the ends ofthe rim together. Fig. 7 is.a vertical sectional view of the'completedrim shown in Fig.- 6. Fig. 8 is a planview of the complete spoke-spiderset up. Figs. 9 and 10 are plan views of the rorerscly-relatml duplicatespider-blanks which are preferably employed in the formation of thepulley-hub and spokes.

Like refercncenumcrals designate corresponding parts in the severalfigures of the drawings.

In carrying out the invention the first step in the process resides inpreparing a sheetmetal blank 1, from which the complete rim is to beformed. 'lhelength of this blank is equal to the circumference of acircle whose diameter is that of the complete rim at the inner side ofthe groove or concave less the thickness of the metal. The distinctivefeature of the present invention resides in forming this blank stripwith a surplus side edge portion to supply the necessary material forthe formation of the peripheral flanges producing the annular groove orconcave. This surplus edge portion is preferably provided for bycrimping the longitudinal edges of the blank by a regular series ofuniform corrugations 2, disposed transversely of the blank andprojecting a short distance inwardly from the side edges toward thelongitudinal center thereof. 'vllhcse corrugations 2 produce a crimpcdedge, and the same extend equally above and below the thickness orcentral portion of the blank, as plainly indicated in Fig. 2, and thesinuous lines formed by-the corrugations 2 are equal in length to thecircumference of a circle whose diameter is that of the pulley-rim fromoutside to outside of its annular groove or concave. The crimped orcorrugated blank strip is next bent into circular form with its endsabutting together, and the blank then appears as shown in Fig. 3. tureis then completed by pressing out the crimps or corrugations 2 to supplythe necessary material for the formation of the peripheral side flanges'3, thereby producing the an- The rim strucnular groove or concave 4, asshown in Fig.

5. This figure isanedge sectional view of the completed rim inelevation.

It will be seen from the foregoing that it is only by reason ofproviding the surplus edge portions through the medium of crimps, corrugations, or the like that it is possible to construct the blank in thefirst instance so as to take care of the greater diameter of theperipheral side flanges 3 without danger of cracking, breaking, orotherwise weakening the rim through the production of the annular grooveor concave 4.

Contiguous to each end of the rim-blank. l

andvbetween the opposite rowsofcorruga:

tions or crimps 2 the said blank is pierced by the sockets or. openings5, which respectively receive the holding-tenons 6 of theretaining-spokes 7 and 8, carried, respectively, by the separate twinspoke-spider blanks 9 and 9 This provides an arrangement wherein whatmay be termed a duplex spokespider provides means for holding the endsof the rim in closed abutting relation.

In Figs. 9 and 10 the separate twin -spoke spider blanks 9 and 9 areillustrated, said blanks being exact duplicates, but placed in revcrse'drelation, so as to make the one right and the other left. Each of theseblanks is slitted lengthwise to within a distance equal to half thelength of the hub-section 10 to provide strips of equal width, three ofwhich,

11 11 11, are of equal length, while the fourth,

7 and 8, respectively, are somewhat shorter and provided with the tenons6- aforesaid. The unslitted portions of the blanks 9 and 9 are rolledinto tubular form, producing the hub-sections 10, whose inner ends arebrought together, as shown in Fig. 7, and the arms 7, 8, and 11 are bentup at substantially right angles and are formed with outer terminaldeflections 12, engaging at the under side of the pulley-rim, it beingobserved that the defiections 12 of the separate spider-blanksrespectively engage against opposite side por-' tions of the rim, whiletheretaining-spokes' 7- and 8 are held interlocked with the rim in themanner explained.

Having thus described the invention, what is claimed,and desired tobesecured by Letters f Patent, is n 1. The process of making sheet-metalpul tions equaling in length the circumference of a circle whosediameter is that of the rim from outside to outside of its groove,bendingthe strip into circular form, and shaping the surplus edges toproduce the groove.

crimping the longitudinal edges of the blank stripto expand said sideedges, bending the strip into circular form, and pressing out thecrimps.

'3. The process of making sheet-metal pul leys orlike metal formsconsisting infirst exbelow the blank and extending a short distanceinwardly from'the edges thereof, bending the blank into circular form,and pressing out'the crimps.

4. The'process of making a pulley-rim of concave cross-sectional shapefrom a' blank strip, which consists in'providing the marginal edgeportions of the strip with a series of corrugations ofgradually-decreasing depth from the edges of the strip toward the centerof the same, bending the corrugated strip into circular form and thenpressing out the cor rugations, substantiallyas described. v

In witness-whereof I have hereunto set my hand in presence oftwo'witnesses.

' WILLIAM LIVINGSTONE. Witnesses:

PAUL NEUHUT,

EDMUND HANooo The process of making sheet metal pulleys or like metalforms consisting in first.

